pColl = sqlite4ExprCollSeq(pParse, pFarg->a[i].pExpr);
        }
      }
      if( pDef->flags & SQLITE4_FUNC_NEEDCOLL ){
        if( !pColl ) pColl = db->pDfltColl; 
        sqlite4VdbeAddOp4(v, OP_CollSeq, 0, 0, 0, (char *)pColl, P4_COLLSEQ);
      }



      sqlite4VdbeAddOp4(v, OP_Function, constMask, r1, target,
                        (char*)pDef, P4_FUNCDEF);
      sqlite4VdbeChangeP5(v, (u8)nFarg);
      if( nFarg ){
        sqlite4ReleaseTempRange(pParse, r1, nFarg);
      }
      break;

          pColl = sqlite4ExprCollSeq(pParse, pFarg->a[i].pExpr);
        }
      }
      if( pDef->flags & SQLITE4_FUNC_NEEDCOLL ){
        if( !pColl ) pColl = db->pDfltColl; 
        sqlite4VdbeAddOp4(v, OP_CollSeq, 0, 0, 0, (char *)pColl, P4_COLLSEQ);
      }
      if( pDef->bMatchinfo ){
        sqlite4VdbeAddOp1(v, OP_Mifunction, pFarg->a[0].pExpr->iTable);
      }
      sqlite4VdbeAddOp4(v, OP_Function, constMask, r1, target,
                        (char*)pDef, P4_FUNCDEF);
      sqlite4VdbeChangeP5(v, (u8)nFarg);
      if( nFarg ){
        sqlite4ReleaseTempRange(pParse, r1, nFarg);
      }
      break;

**   expr := expr NOT expr
**   expr := expr AND expr
**   expr := expr OR  expr
**   expr := LP expr RP
*/

/*
** Context object used by expression parser.
*/
typedef struct Fts5Expr Fts5Expr;
typedef struct Fts5ExprNode Fts5ExprNode;
typedef struct Fts5List Fts5List;
typedef struct Fts5Parser Fts5Parser;
typedef struct Fts5ParserToken Fts5ParserToken;
typedef struct Fts5Phrase Fts5Phrase;
................................................................................
  Fts5ExprNode *pRight;
  const u8 *aPk;                  /* Primary key of current entry (or null) */
  int nPk;                        /* Size of aPk[] in bytes */
};

struct Fts5Expr {
  Fts5ExprNode *pRoot;


};

/*
** FTS5 specific cursor data.
*/
struct Fts5Cursor {
  sqlite4 *db;
  Fts5Info *pInfo;
  Fts5Expr *pExpr;                /* MATCH expression for this cursor */

  KVByteArray *aKey;              /* Buffer for primary key */
  int nKeyAlloc;                  /* Bytes allocated at aKey[] */



};

/*
** This type is used when reading (decoding) an instance-list.
*/
typedef struct InstanceList InstanceList;
struct InstanceList {
................................................................................
  int nCol,                       /* Size of array azCol[] */
  const char *zExpr,              /* FTS expression text */
  Fts5Expr **ppExpr,              /* OUT: Expression object */
  char **pzErr                    /* OUT: Error message */
){
  int rc = SQLITE4_OK;
  Fts5Parser sParse;

  int nExpr;
  int i;
  Fts5Expr *pExpr;

  int nHier = 0;
  int nHierAlloc = 0;
  ExprHier *aHier = 0;
................................................................................
            rc = SQLITE4_NOMEM;
          }else{
            pNode->eType = TOKEN_PRIMITIVE;
            pNode->pPhrase = pPhrase;
            *pp = pNode;
          }
        }

        break;
      }

      case TOKEN_AND:
      case TOKEN_OR:
      case TOKEN_NOT: {
        Fts5ExprNode **pp = aHier[nHier-1].ppNode;
................................................................................
    if( aHier[i].nOpen>0 ) rc = SQLITE4_ERROR;
  }

  if( rc!=SQLITE4_OK ){
    fts5ExpressionFree(db, pExpr);
    *pzErr = sParse.zErr;
  }else{

    *ppExpr = pExpr;
  }
  sqlite4DbFree(db, aHier);
  return rc;
}

/*
................................................................................
  i = putVarint32(pCsr->aKey, iTbl);
  memcpy(&pCsr->aKey[i], aPk, nPk);

  *paKey = pCsr->aKey;
  *pnKey = nReq;
  return SQLITE4_OK;
}

















































































/**************************************************************************
***************************************************************************
** Below this point is test code.
*/
#ifdef SQLITE4_TEST
static int fts5PrintExprNode(sqlite4 *, const char **, Fts5ExprNode *, char **);

**   expr := expr NOT expr
**   expr := expr AND expr
**   expr := expr OR  expr
**   expr := LP expr RP
*/

/*
** Structure types used by this module.
*/
typedef struct Fts5Expr Fts5Expr;
typedef struct Fts5ExprNode Fts5ExprNode;
typedef struct Fts5List Fts5List;
typedef struct Fts5Parser Fts5Parser;
typedef struct Fts5ParserToken Fts5ParserToken;
typedef struct Fts5Phrase Fts5Phrase;
................................................................................
  Fts5ExprNode *pRight;
  const u8 *aPk;                  /* Primary key of current entry (or null) */
  int nPk;                        /* Size of aPk[] in bytes */
};

struct Fts5Expr {
  Fts5ExprNode *pRoot;
  int nPhrase;                    /* Number of Fts5Str objects in query */
  Fts5Str **apPhrase;
};

/*
** FTS5 specific cursor data.
*/
struct Fts5Cursor {
  sqlite4 *db;
  Fts5Info *pInfo;
  Fts5Expr *pExpr;                /* MATCH expression for this cursor */

  KVByteArray *aKey;              /* Buffer for primary key */
  int nKeyAlloc;                  /* Bytes allocated at aKey[] */

  KVCursor *pCsr;                 /* Cursor used to retrive values */
  Mem *aMem;                      /* Array of column values */
};

/*
** This type is used when reading (decoding) an instance-list.
*/
typedef struct InstanceList InstanceList;
struct InstanceList {
................................................................................
  int nCol,                       /* Size of array azCol[] */
  const char *zExpr,              /* FTS expression text */
  Fts5Expr **ppExpr,              /* OUT: Expression object */
  char **pzErr                    /* OUT: Error message */
){
  int rc = SQLITE4_OK;
  Fts5Parser sParse;
  int nStr = 0;
  int nExpr;
  int i;
  Fts5Expr *pExpr;

  int nHier = 0;
  int nHierAlloc = 0;
  ExprHier *aHier = 0;
................................................................................
            rc = SQLITE4_NOMEM;
          }else{
            pNode->eType = TOKEN_PRIMITIVE;
            pNode->pPhrase = pPhrase;
            *pp = pNode;
          }
        }
        nStr++;
        break;
      }

      case TOKEN_AND:
      case TOKEN_OR:
      case TOKEN_NOT: {
        Fts5ExprNode **pp = aHier[nHier-1].ppNode;
................................................................................
    if( aHier[i].nOpen>0 ) rc = SQLITE4_ERROR;
  }

  if( rc!=SQLITE4_OK ){
    fts5ExpressionFree(db, pExpr);
    *pzErr = sParse.zErr;
  }else{
    pExpr->nPhrase = nStr;
    *ppExpr = pExpr;
  }
  sqlite4DbFree(db, aHier);
  return rc;
}

/*
................................................................................
  i = putVarint32(pCsr->aKey, iTbl);
  memcpy(&pCsr->aKey[i], aPk, nPk);

  *paKey = pCsr->aKey;
  *pnKey = nReq;
  return SQLITE4_OK;
}

int sqlite4_mi_column_count(sqlite4_context *pCtx, int *pnCol){
  int rc = SQLITE4_OK;
  if( pCtx->pFts ){
    *pnCol = pCtx->pFts->pInfo->nCol;
  }else{
    rc = SQLITE4_MISUSE;
  }
  return rc;
}

int sqlite4_mi_column_size(sqlite4_context *pCtx, int iCol, int *pnToken){
  int rc = SQLITE4_OK;
  if( pCtx->pFts ){
  }else{
    rc = SQLITE4_MISUSE;
  }
  return rc;
}

int sqlite4_mi_column_value(
  sqlite4_context *pCtx, 
  int iCol, 
  sqlite4_value **ppVal
){
  int rc = SQLITE4_OK;
  if( pCtx->pFts ){
  }else{
    rc = SQLITE4_MISUSE;
  }
  return rc;
}

int sqlite4_mi_phrase_count(sqlite4_context *pCtx, int *pnPhrase){
  int rc = SQLITE4_OK;
  if( pCtx->pFts ){
    *pnPhrase = pCtx->pFts->pExpr->nPhrase;
  }else{
    rc = SQLITE4_MISUSE;
  }
  return rc;
}

int sqlite4_mi_match_count(
  sqlite4_context *pCtx, 
  int iCol, 
  int iPhrase, 
  int *pnMatch
){
  int rc = SQLITE4_OK;
  if( pCtx->pFts ){
  }else{
    rc = SQLITE4_MISUSE;
  }
  return rc;
}

int sqlite4_mi_match_offset(
  sqlite4_context *pCtx, 
  int iCol, 
  int iPhrase, 
  int iMatch, 
  int *piOff
){
}

int sqlite4_mi_total_match_count(
  sqlite4_context *pCtx, 
  int iCol, 
  int iPhrase, 
  int *pnMatch, 
  int *pnDoc
){
}

int sqlite4_mi_total_size(sqlite4_context *pCtx, int iCol, int *pnToken){
}

int sqlite4_mi_total_count(sqlite4_context *pCtx, int *pnRow){
}

/**************************************************************************
***************************************************************************
** Below this point is test code.
*/
#ifdef SQLITE4_TEST
static int fts5PrintExprNode(sqlite4 *, const char **, Fts5ExprNode *, char **);

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
*/

#include "sqliteInt.h"






static int fts5SimpleCreate(
  void *pCtx, 
  const char **azArg, 
  int nArg, 
  sqlite4_tokenizer **pp
){
................................................................................
  return SQLITE4_OK;
}

static int fts5SimpleDestroy(sqlite4_tokenizer *p){
  return SQLITE4_OK;
}

static char fts5Tolower(char c){
  if( c>='A' && c<='Z' ) c = c + ('a' - 'A');
  return c;

}

static int fts5SimpleTokenize(
  void *pCtx, 
  sqlite4_tokenizer *p,
  const char *zDoc,
  int nDoc,
................................................................................
  sqlite4_env *pEnv = sqlite4_db_env(db);

  rc = sqlite4_create_tokenizer(db, "simple", (void *)pEnv, 
      fts5SimpleCreate, fts5SimpleTokenize, fts5SimpleDestroy
  );
  if( rc!=SQLITE4_OK ) return rc;







  return rc;
}

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
*/

#include "sqliteInt.h"

static char fts5Tolower(char c){
  if( c>='A' && c<='Z' ) c = c + ('a' - 'A');
  return c;
}

static int fts5SimpleCreate(
  void *pCtx, 
  const char **azArg, 
  int nArg, 
  sqlite4_tokenizer **pp
){
................................................................................
  return SQLITE4_OK;
}

static int fts5SimpleDestroy(sqlite4_tokenizer *p){
  return SQLITE4_OK;
}

static void fts5Rank(sqlite4_context *pCtx, int nArg, sqlite4_value **apArg){
}

static void fts5Snippet(sqlite4_context *pCtx, int nArg, sqlite4_value **apArg){
}

static int fts5SimpleTokenize(
  void *pCtx, 
  sqlite4_tokenizer *p,
  const char *zDoc,
  int nDoc,
................................................................................
  sqlite4_env *pEnv = sqlite4_db_env(db);

  rc = sqlite4_create_tokenizer(db, "simple", (void *)pEnv, 
      fts5SimpleCreate, fts5SimpleTokenize, fts5SimpleDestroy
  );
  if( rc!=SQLITE4_OK ) return rc;

  rc = sqlite4_create_mi_function(db, "rank", 0, SQLITE4_UTF8, 0, fts5Rank, 0);
  if( rc!=SQLITE4_OK ) return rc;

  rc = sqlite4_create_mi_function(
      db, "snippet", -1, SQLITE4_UTF8, 0, fts5Snippet, 0
  );
  return rc;
}

  if( pArg && pArg->nRef==0 ){
    assert( rc!=SQLITE4_OK );
    xDestroy(p);
    sqlite4DbFree(db, pArg);
  }

 out:
























  rc = sqlite4ApiExit(db, rc);
  sqlite4_mutex_leave(db->mutex);
  return rc;
}

#ifndef SQLITE4_OMIT_UTF16
int sqlite4_create_function16(

  if( pArg && pArg->nRef==0 ){
    assert( rc!=SQLITE4_OK );
    xDestroy(p);
    sqlite4DbFree(db, pArg);
  }

 out:
  rc = sqlite4ApiExit(db, rc);
  sqlite4_mutex_leave(db->mutex);
  return rc;
}

int sqlite4_create_mi_function(
  sqlite4 *db,
  const char *zFunc,
  int nArg,
  int enc,
  void *p,
  void (*xFunc)(sqlite4_context*,int,sqlite4_value **),
  void (*xDestroy)(void *)
){
  int rc;
  int n;

  n = nArg + (nArg>=0);
  sqlite4_mutex_enter(db->mutex);
  rc = sqlite4_create_function_v2(db, zFunc, n, enc, p, xFunc, 0,0,xDestroy);
  if( rc==SQLITE4_OK ){
    FuncDef *p = sqlite4FindFunction(db, zFunc, -1, n, enc, 0);
    p->bMatchinfo = 1;
  }
  rc = sqlite4ApiExit(db, rc);
  sqlite4_mutex_leave(db->mutex);
  return rc;
}

#ifndef SQLITE4_OMIT_UTF16
int sqlite4_create_function16(

    testcase( iCol==BMS );
    testcase( iCol==BMS-1 );
    pItem->colUsed |= ((Bitmask)1)<<(iCol>=BMS ? BMS-1 : iCol);
    ExprSetProperty(p, EP_Resolved);
  }
  return p;
}





























static void resolveMatch(Parse *pParse, NameContext *pNC, Expr *pExpr){
  Expr *pLeft = pExpr->pLeft;
  SrcList *pSrc = pNC->pSrcList;
  SrcListItem *pItem;
  char *zLhs;
  int i;
................................................................................
             nId, zId);
        pNC->nErr++;
      }
      if( is_agg ){
        pExpr->op = TK_AGG_FUNCTION;
        pNC->hasAgg = 1;
      }





      if( is_agg ) pNC->allowAgg = 0;
      sqlite4WalkExprList(pWalker, pList);
      if( is_agg ) pNC->allowAgg = 1;


      /* FIX ME:  Compute pExpr->affinity based on the expected return
      ** type of the function 
      */
      return WRC_Prune;
    }
#ifndef SQLITE4_OMIT_SUBQUERY
    case TK_SELECT:

    testcase( iCol==BMS );
    testcase( iCol==BMS-1 );
    pItem->colUsed |= ((Bitmask)1)<<(iCol>=BMS ? BMS-1 : iCol);
    ExprSetProperty(p, EP_Resolved);
  }
  return p;
}

static void resolveMatchArg(Parse *pParse, NameContext *pNC, Expr *pExpr){
  SrcList *pSrc = pNC->pSrcList;
  SrcListItem *pItem;
  char *zLhs;
  int i;
  Index *pIdx;

  if( pExpr->op!=TK_ID || pSrc==0 || pExpr==0 ){
    sqlite4ErrorMsg(pParse, "first argument xxx must be a table name");
    return;
  }
  zLhs = pExpr->u.zToken;

  for(i=0; i<pSrc->nSrc; i++){
    pItem = &pSrc->a[i];
    if( pItem->zAlias && sqlite4StrICmp(zLhs, pItem->zAlias)==0 ) break;
    if( pItem->zAlias==0 && sqlite4StrICmp(zLhs, pItem->zName)==0 ) break;
  }
  if( i==pSrc->nSrc ){
    sqlite4ErrorMsg(pParse, "no such table: %s", zLhs);
    return;
  }

  pExpr->op = TK_NULL;
  pExpr->iTable = pItem->iCursor;
  ExprSetProperty(pExpr, EP_Resolved);
}

static void resolveMatch(Parse *pParse, NameContext *pNC, Expr *pExpr){
  Expr *pLeft = pExpr->pLeft;
  SrcList *pSrc = pNC->pSrcList;
  SrcListItem *pItem;
  char *zLhs;
  int i;
................................................................................
             nId, zId);
        pNC->nErr++;
      }
      if( is_agg ){
        pExpr->op = TK_AGG_FUNCTION;
        pNC->hasAgg = 1;
      }

      if( pParse->nErr==0 ){
        if( pDef->bMatchinfo ){
          resolveMatchArg(pParse, pNC, n>0 ? pList->a[0].pExpr : 0);
        }
        if( is_agg ) pNC->allowAgg = 0;
        sqlite4WalkExprList(pWalker, pList);
        if( is_agg ) pNC->allowAgg = 1;
      }

      /* FIX ME:  Compute pExpr->affinity based on the expected return
      ** type of the function 
      */
      return WRC_Prune;
    }
#ifndef SQLITE4_OMIT_SUBQUERY
    case TK_SELECT:

      const char*, int, 
      int(*x)(void *ctx, int iWeight, int iOff, 
              const char *zToken, int nToken, int iSrc, int nSrc)
  ),
  int (*xDestroy)(sqlite4_tokenizer *)
);








































































/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE4_OMIT_FLOATING_POINT
# undef double
#endif

#ifdef __cplusplus
}  /* End of the 'extern "C"' block */
#endif
#endif

      const char*, int, 
      int(*x)(void *ctx, int iWeight, int iOff, 
              const char *zToken, int nToken, int iSrc, int nSrc)
  ),
  int (*xDestroy)(sqlite4_tokenizer *)
);

/*
** CAPI4REF: Register a matchinfo function.
*/
int sqlite4_create_mi_function(
  sqlite4 *db,
  const char *zFunc,
  int nArg,
  int enc,
  void *p,
  void (*xFunc)(sqlite4_context*,int,sqlite4_value **),
  void (*xDestroy)(void *)
);

/*
** Special functions that may be called from within matchinfo UDFs. All
** return an SQLite error code - SQLITE4_OK if successful, or some other
** error code otherwise.
**
** sqlite4_mi_column_count():
**   Set *pnCol to the number of columns in the queried table.
**
** sqlite4_mi_column_size():
**   Set *pnToken to the number of tokens in the value stored in column iCol 
**   of the current row.
**
** sqlite4_mi_column_value():
**   Set *ppVal to point to an sqlite4_value object containing the value
**   read from column iCol of the current row. This object is valid until
**   the function callback returns.
**
** sqlite4_mi_phrase_count():
**   Set *pnPhrase to the number of phrases in the query.
**
** sqlite4_mi_match_count():
**   Set *pn to the number of occurences of phrase iPhrase in column iCol of
**   the current row.
**
** sqlite4_mi_total_match_count():
**   Set *pnMatch to the total number of occurrences of phrase iPhrase
**   in column iCol of all rows in the indexed table. Set *pnDoc to the
**   number of rows that contain at least one match for phrase iPhrase in
**   column iCol.
**
** sqlite4_mi_match_offset():
**   Set *piOff to the token offset of the iMatch'th instance of phrase
**   iPhrase in column iCol of the current row. If any parameter is out
**   of range (i.e. too large) it is not an error. In this case *piOff is 
**   set to -1 before returning.
**   
** sqlite4_mi_total_size():
**   Set *pnToken to the total number of tokens in column iCol of all rows
**   in the indexed table.
**
** sqlite4_mi_total_count():
**   Set *pnRow to the total number of rows in the indexed table.
*/
int sqlite4_mi_column_count(sqlite4_context *, int *pnCol);
int sqlite4_mi_column_size(sqlite4_context *, int iCol, int *pnToken);
int sqlite4_mi_column_value(sqlite4_context *, int iCol, sqlite4_value **ppVal);

int sqlite4_mi_phrase_count(sqlite4_context *, int *pnPhrase);
int sqlite4_mi_match_count(sqlite4_context *, int iCol, int iPhrase, int *pn);
int sqlite4_mi_match_offset(
    sqlite4_context *, int iCol, int iPhrase, int iMatch, int *piOff); 

int sqlite4_mi_total_match_count(
    sqlite4_context *, int iCol, int iPhrase, int *pnMatch, int *pnDoc);

int sqlite4_mi_total_size(sqlite4_context *, int iCol, int *pnToken);
int sqlite4_mi_total_count(sqlite4_context *, int *pnRow);

/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE4_OMIT_FLOATING_POINT
# undef double
#endif

#ifdef __cplusplus
}  /* End of the 'extern "C"' block */
#endif
#endif

  FuncDef *pSameName;  /* Next with a different name but the same hash */
  void (*xFunc)(sqlite4_context*,int,sqlite4_value**); /* Regular function */
  void (*xStep)(sqlite4_context*,int,sqlite4_value**); /* Aggregate step */
  void (*xFinalize)(sqlite4_context*);                /* Aggregate finalizer */
  char *zName;         /* SQL name of the function. */
  FuncDef *pNextName;  /* Next function with a different name */
  FuncDestructor *pDestructor;   /* Reference counted destructor function */

};

/*
** A table of SQL functions.  
**
** The content is a linked list of FuncDef structures with branches.  When
** there are two or more FuncDef objects with the same name, they are 

  FuncDef *pSameName;  /* Next with a different name but the same hash */
  void (*xFunc)(sqlite4_context*,int,sqlite4_value**); /* Regular function */
  void (*xStep)(sqlite4_context*,int,sqlite4_value**); /* Aggregate step */
  void (*xFinalize)(sqlite4_context*);                /* Aggregate finalizer */
  char *zName;         /* SQL name of the function. */
  FuncDef *pNextName;  /* Next function with a different name */
  FuncDestructor *pDestructor;   /* Reference counted destructor function */
  u8 bMatchinfo;       /* True for matchinfo function */
};

/*
** A table of SQL functions.  
**
** The content is a linked list of FuncDef structures with branches.  When
** there are two or more FuncDef objects with the same name, they are 

** to retrieve the collation sequence set by this opcode is not available
** publicly, only to user functions defined in func.c.
*/
case OP_CollSeq: {
  assert( pOp->p4type==P4_COLLSEQ );
  break;
}









/* Opcode: Function P1 P2 P3 P4 P5
**
** Invoke a user function (P4 is a pointer to a Function structure that
** defines the function) with P5 arguments taken from register P2 and
** successors.  The result of the function is stored in register P3.
** Register P3 must not be one of the function inputs.
................................................................................
    ctx.pFunc = ctx.pVdbeFunc->pFunc;
  }

  ctx.s.flags = MEM_Null;
  ctx.s.db = db;
  ctx.s.xDel = 0;
  ctx.s.zMalloc = 0;








  /* The output cell may already have a buffer allocated. Move
  ** the pointer to ctx.s so in case the user-function can use
  ** the already allocated buffer instead of allocating a new one.
  */
  sqlite4VdbeMemMove(&ctx.s, pOut);
  MemSetTypeFlag(&ctx.s, MEM_Null);

** to retrieve the collation sequence set by this opcode is not available
** publicly, only to user functions defined in func.c.
*/
case OP_CollSeq: {
  assert( pOp->p4type==P4_COLLSEQ );
  break;
}

/* Opcode: Mifunction P1
*/
case OP_Mifunction: {
  pc++;
  pOp++;
  /* fall through to OP_Function */
};

/* Opcode: Function P1 P2 P3 P4 P5
**
** Invoke a user function (P4 is a pointer to a Function structure that
** defines the function) with P5 arguments taken from register P2 and
** successors.  The result of the function is stored in register P3.
** Register P3 must not be one of the function inputs.
................................................................................
    ctx.pFunc = ctx.pVdbeFunc->pFunc;
  }

  ctx.s.flags = MEM_Null;
  ctx.s.db = db;
  ctx.s.xDel = 0;
  ctx.s.zMalloc = 0;
  if( pOp[-1].opcode==OP_Mifunction ){
    ctx.pFts = p->apCsr[pOp[-1].p1]->pFts;
    apVal++;
    n--;
  }else{
    ctx.pFts = 0;
  }

  /* The output cell may already have a buffer allocated. Move
  ** the pointer to ctx.s so in case the user-function can use
  ** the already allocated buffer instead of allocating a new one.
  */
  sqlite4VdbeMemMove(&ctx.s, pOut);
  MemSetTypeFlag(&ctx.s, MEM_Null);

struct sqlite4_context {
  FuncDef *pFunc;       /* Pointer to function information.  MUST BE FIRST */
  VdbeFunc *pVdbeFunc;  /* Auxilary data, if created. */
  Mem s;                /* The return value is stored here */
  Mem *pMem;            /* Memory cell used to store aggregate context */
  int isError;          /* Error code returned by the function. */
  CollSeq *pColl;       /* Collating sequence */

};

/*
** An Explain object accumulates indented output which is helpful
** in describing recursive data structures.
*/
struct Explain {

struct sqlite4_context {
  FuncDef *pFunc;       /* Pointer to function information.  MUST BE FIRST */
  VdbeFunc *pVdbeFunc;  /* Auxilary data, if created. */
  Mem s;                /* The return value is stored here */
  Mem *pMem;            /* Memory cell used to store aggregate context */
  int isError;          /* Error code returned by the function. */
  CollSeq *pColl;       /* Collating sequence */
  Fts5Cursor *pFts;     /* fts5 cursor for matchinfo functions */
};

/*
** An Explain object accumulates indented output which is helpful
** in describing recursive data structures.
*/
struct Explain {

      while( pOp<pEnd ){
        if( pOp->p1==pLevel->iTabCur && pOp->opcode==OP_Column ){
          pOp->p1 = pLevel->iIdxCur;
        }
        pOp++;
      }
    }


















  }

  /* Final cleanup
  */
  pParse->nQueryLoop = pWInfo->savedNQueryLoop;
  whereInfoFree(db, pWInfo);
  return;
}

      while( pOp<pEnd ){
        if( pOp->p1==pLevel->iTabCur && pOp->opcode==OP_Column ){
          pOp->p1 = pLevel->iIdxCur;
        }
        pOp++;
      }
    }

    if( (pLevel->plan.wsFlags & WHERE_INDEXED)
     && (pLevel->plan.u.pIdx->eIndexType==SQLITE4_INDEX_FTS5)
    ){
      VdbeOp *pOp;
      VdbeOp *pEnd;

      assert( pLevel->iTabCur!=pLevel->iIdxCur );
      pOp = sqlite4VdbeGetOp(v, pWInfo->iTop);
      pEnd = &pOp[sqlite4VdbeCurrentAddr(v) - pWInfo->iTop];

      while( pOp<pEnd ){
        if( pOp->p1==pLevel->iTabCur && pOp->opcode==OP_Mifunction ){
          pOp->p1 = pLevel->iIdxCur;
        }
        pOp++;
      }
    }
  }

  /* Final cleanup
  */
  pParse->nQueryLoop = pWInfo->savedNQueryLoop;
  whereInfoFree(db, pWInfo);
  return;
}

  2 {a:a}  {1}
  3 {b:a}  {2}
  4 {c:a}  {1 2}
  5 {a:a*} {1}
} {
  do_execsql_test 7.$tn {SELECT docid FROM t7 WHERE t7 MATCH $expr} $res
}














finish_test

  2 {a:a}  {1}
  3 {b:a}  {2}
  4 {c:a}  {1 2}
  5 {a:a*} {1}
} {
  do_execsql_test 7.$tn {SELECT docid FROM t7 WHERE t7 MATCH $expr} $res
}

#-------------------------------------------------------------------------
#
do_execsql_test 8.0 {
  CREATE TABLE t8(a PRIMARY KEY, b, c);
  CREATE INDEX i8 ON t8 USING fts5();
  INSERT INTO t8 VALUES('one', 'a b c', 'a a a');
  INSERT INTO t8 VALUES('two', 'd e f', 'b b b');
}

do_execsql_test 8.1 {
  SELECT rank(t8) FROM t8 WHERE t8 MATCH 'b a'
}

finish_test